Abstract: A encryption approach of Montgomery-Form ECC for remote sensing images is proposed,combining with faster computing speed of scalar multiplication on Montgomery-Form ECC compared with Weierstrass-Form ECC,mutual authentication of ECDH key exchange system based on certification authority respectively.The simulation analysis shows that the approach improves computing speed for mass data of remote sensing images;strengthens security of plaintext embedding;achieves mutual authentication between sender and recipient,and works for encryption and decryption for mass data of remote sensing more efficiently.