在抗寒桃育种及引种工作中，育种亲本及优系的抗寒性常采用田间自然调查评价法。田间自然调查评价法受自然条件的区域性和不确定性影响，具有成本高，评价周期长，区分度差和干扰因素多等特点。同时难以对桃资源的抗寒潜力作出评估，在人工模拟低温条件下，运用电导法、电阻抗法等结合Logistic方程确定半致死温度，对桃资源抗寒能力快速进行初步判定，这对于挖掘优异抗寒桃种质，加速抗寒桃育种和引种工作具有重要意义。文章研究通过测定桃树一年生枝条在人工模拟低温条件下的电解质外渗率，结合Logistic方程计算半致死温度LT50。本文于2015—2016年对辽宁省兴城市中国农业科学院果树研究所桃资源圃22份桃资源的抗寒性展开评估，为抗寒桃的引种及育种工作提供科学依据。

In the breeding and introduction of cold-resistant peach, the cold resistance of parents and superior superior varieties is often evaluated by field natural investigation. The evaluation of field natural investigation is affected by the regional and uncertainty of natural conditions, with high cost, long evaluation cycle, poor differentiation and lot of interference factors. At the same time, it is difficult to evaluate the cold resistance potential of resources we have got. Under the condition of artificial simulation of low temperature, the semi-lethal temperature is determined by conductivity method, electrical impedance method, etc. combined with the logistic equation, and the cold resistance ability of peach resources is quickly preliminarily determined, which is of great significance for mining excellent cold-resistant peach germplasm and accelerating the breeding and introduction of cold-resistant peach. In this study, the electrolyte leakage rate of one-year branches of peach trees under different low temperatures and the logistic equation were used to calculate the semi lethal temperature LT50, to evaluate the cold resistance of 22 peach resources in the peach resource nursery of the fruit tree Research Institute of the CAAS in Xingcheng City, Liaoning Province. And it provides a scientific basis for the introduction and breeding of cold resistant peach.