Since the space for saving cipher texts is more than that for saving plaintexts in elliptic curve cryptography encrypting process, a method of generating cipher texts which utilized elliptic curve cryptography based on plaintext length was proposed. Firstly, by analyzing encrypting operation process of elliptic curve encryption, it was deduced that the space for cipher texts of elliptic curve points was decided by the number of plaintexts in elliptic curve points. Secondly, by fusing the encrypting patterns based on segmentation and combination plaintexts, an encrypting model was constructed, and plaintext segmentation algorithm and plaintext combination algorithm were put forward to generate the minimum number of elliptic curve points. Finally, the demanded space for saving cipher texts in elliptic curve points was calculated, and the solutions for reducing the number of cipher texts in elliptic curve points were given. By the analysis and calculation, it is shown that the space of cipher text elliptic curve points decreases 88.2% by segmentation plaintexts and decreases 90.2% by combination plaintexts. The results show the method can decrease the number of cipher texts in elliptic curve points and the storage space demand for hardware.