The invention relates to a data transmission method for a grid mobile terminal based on an improved DES encryption algorithm, comprising: inputting an entry parameter of a DES encryption algorithm, translating and dividing the significant digits of the key Key into two parts, creating 16 sub-keys K[j][48] having a length of 48 bits, dividing the 64-bit plaintext data into 16 copies every four bits, encrypting the order of the sub-keys after the location exchange, encrypting the plaintext data, performing S-box operation to obtain the DES encryption result of the transmission, and decrypting the information transmitted. At the same time, a right control module, an anti-theft mode and positioning service module, and a smart dialing module are added on the mobile terminal side. The inventionmakes the attacker cannot obtain the transformation situation through a large amount of plaintext, reduces the complexity and cumbersomeness of the algorithm, and makes the operation efficiency of thealgorithm basically not affected, makes the complex degree of the exhaustive attack also become more cumbersome since the sub keys change corresponding to the order of the transformation, and greatlyimproves the security of data protection.