Container is the key transport carrier in the process of cross-border logistics, effective management is crucial, and in order to facilitate the identification, management and handover, facilitate document preparation and information transmission, the international organization for standardization issued the container code, identification and marking (ISO6346-1995), the standard clearly specified the content of the container, marked font size, marking location, etc.According to this standard, container markers can be divided into two categories: necessary markers and optional markers.Because "necessary mark" is the content that containers need to mark, the following will focus on popular science.

        The marks stipulated by the International Organization for Standardization have two categories of essential marks and optional marks, and each mark is divided into identification marks and job marks.Specifically, the container has the main box code; box number or serial number, check number; container size and type code.

一、 Necessary marks

           1. Identify the markers.It includes the box main code, equipment identification code, serial number, and check the number composition.

       （1） Main code of the box (Owner Code).One of the three capital Latin letters registered with the international container bureau, such as one of the main box codes is "MSK".

       （2）Equipment identification code.It is the fourth letter of the main box code immediately followed, used to indicate the type of container, and the most commonly is the "U", used to represent all regular containers.Also "J" means carrying the removable container, and "Z" means the trailer and chassis car of the container.

       （3）The Order number, also known as the "box number" or the "box registration code" (Registration Code), which consists of six Arabic letters.If the valid number is not 6 digits, then use "0" to distinguish the container from the same container owner, such as "053842".

       （4） Check the numbers.Also known as "check code" (Check Digit), check the number is used to verify whether the box main code and sequence number record is accurate, obtained by computer processing.It is located after the sequence number, and is represented by an Arabic numeral plus one box.

        2. Job mark.It includes the following three contents:

    （1）Rated weight and self-determined weight mark.The rated weight is the total weight of the container, and the dead weight is the quality of the empty container (or the empty container weight) of the container, which should be expressed as both kg (kg) and pound (lb) simultaneously;

         （2） Container mark of air-land and water combined transport.Because the strength of the container can only stack up to two layers.Therefore, the International Organization for Standardization has set up a special mark for the container, which is black, located in the upper left corner of the side walls and end walls, and that the minimum size of the mark is: 127mm height, 355mm length, the font height of the letter mark is at least 76mm;

    （3）Warning mark of electric shock on the boarding roof.The colored triangle, with a yellow background, is usually located in a tank container and at the top escalator to warn people of the danger of electric shock.

 二、Select the mark

          1. Identify the markers.it contains:

    （1）National and regional codes, such as CN in China and US in the United States;

     （2）Size and type code (box code).

       2. Job mark.it contains:

   （1）Ultra-high mark, marked with a black number and border on the yellow bottom, which is placed on the lower left corner of each side of the container, about 0.6m from the bottom of the container, and which is placed below the main mark of the container.Any container exceeding 2.6m shall be marked;

The container can smoothly pass through or enter it in the transportation process of transit, the container must be affixed with various traffic signs as required by the regulations, otherwise, it must go through cumbersome proof procedures, prolong the turnover time of the container.

The main traffic marks on the container are; safety qualification license, container approval license, insect control control board, inspection qualification badge and international railway union mark, etc.

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