This invention discloses a data organizing method for random length record. It includes several steps: the application would divide the memory into certain sized data clot and each of the data clot consists of data section and structure information; separate the data to several clots and add the structure information to each clot; records with length less than one clot would occupy one clot while those with length more than one clot would occupy several clots. This invention could manage the record memory effectively, increase the read-write efficiency and the memory utilization rate.