Aim\ The point singularity and existence of limit cycles in quadratic system of class (ΙΠ)\-\{\%m=0\%\} are discussed. Methods\ The point singularity types are judged by linear matrix

and the existence of limit cycles is given by Hopf bifurcation theory. Results\ Under some conditions the existence and uniqueness of limit cycles has been proved

which improves the previous work. Conclusion\ Under certain conditions the uniqueness and existence of limit cycles were proved.