Abstract: According to the test of the high temperature ductile plastic property and the surface temperature of continuous casting billets, when it contains Nb, V, Ti among 700-900℃ in the third brittleness temperature province, contraction of cross sectional area, the rate RA value is lower, about 36%. If the RA value is more than 40%, the ductile plastic property temperature is about 950℃. Even adopting weak colding, the temperature of casting billet side cape also can't attain enough. Through the measurement, it can give the very big help towards drawing up the craft measure, improving the thermal plasticity of straightening areas and reducing cracks of the casting billet side cape. Combining with the production process and the actual conditions of the continuous caster in our plant, practical discussion and proposals have been made for the preventative measures of eliminating sur-face cracking.