On account of the chaotic phenomena exists in Boost converter of photovoltaic micro-inverter, which is easy to make micro-grid unstable. The production mechanism of chaotic phenomena is analyzed by Boost converter modeling after two-stage micro-inverter is proposed, and reference current parameter is a key factor to effect chaos on the converter. A chaos dynamic control method for Boost converter which is based on the method of resonant parametric perturbation is put forward. The reference current is taken as perturbation parameter, and the expression of the optimal control is deduced. The method of resonant parametric perturbation is available to restrain chaotic phenomena on Boost converter by instance verification. Then the results demonstrate that the presented control strategy is effective and feasible to the study of photovoltaic micro-inverter.