Based on the analysis of the variation of effective panicles, plant height, seed set of main culms panicle, heading of F 1 populations from crosses betweena transgenic rice line and HZP145, K17A, JIN23 A, respectives. It was found that the genetic instability of the transgenic rice line was introduced to the instability of nuclear genome of the transgenic rice line, and its expression could not be affected by cytoplasm of the transgenic rice line itself. The potential value of the transgenic rice line was also discussed.