In the dynamic spectrum access network, how to utilize the spectrum resource efficiently is a vital problem to be solved. Presently, the main study focuses on the scenario that spectrum providers lease spectrum to users for spectrum access. Considering the issue that the user's actual payment capacity and Quality of Service (QoS) demands were different, a joint budget and power control scheme was proposed, the interactions among spectrum providers and users were investigated as a two-stage Stackelberg game model. Based on the budget and QoS demands, providers dynamically adjusted spectrum leasing prices, and users adjusted their demands according to the prices. Finally, the existence and uniqueness of Nash Equilibrium (NE) of maximum profit of users and providers was proved. Simulation results show that the sum of budget of users is the upper bound of the whole network payoff, users and providers can get the optimal profit and achieve the Nash Equilibrium (NE).