Based on continuous observation data of 16 m gradient weather observation tower from 2006 to 2008 at Jinzhou agricultural ecosystem research station, dynamic characteristics of aerodynamic parameters roughness (z₀) and zero-plane displacement(d) over a rainfed maize agroecosystem and their relationships with controlling factors during growing seasons are analyzed. The results showed that d appears about 10 days after jointing when plant height (h) is about 1.40 m and increases from 0.80-1.00 m to 1.00-1.40 m after tasseling stage. z₀ is smaller than 0.20 m before tasseling stage and comes to the maximum about 0.4m before and after milk stage. d/h and z₀/h are 0.40-0.54 and 0.10-0.14, and are decreasing and increasing with LAI, respectively, before h comes to the maximum. Before d appears, negative exponent and positive linear relationships between z₀ and wind speed at 2 m (u₂), z₀ and LAI or h are found. Yet, after d appears, relationship between u₂ and z₀+d is more notable than those between u₂ and z₀ or d. At the same time, positive exponent relationships between z₀ or d and LAI or h respectively are found. LAI and h influence more to z₀ than to d and z₀+d with greater role for the latter. Those relationships are more conspicuous from d appearing to h coming to the maximum. These research conclusions will play an important reference role for setting up aerodynamic parameterization and improving land surface process model.