High speed downlink packet access (HSDPA) is an advanced proposal in 3GPP framework to ensure high peak and average packet data rate. HARQ is a promising technique that can improve system performance significantly in HSDPA, and much research work has been done in the study of its cell throughput performance. However, in this paper packet call throughput comparison between Chase combining and conventional ARQ is emphasized for web browsing service in UTRA TDD HSDPA. From analysis it can be seen that the improvement of H-ARQ on packet call throughput is related to system load. Based on the analysis the ways to guarantee QoS is also discussed. Using a dynamic system simulator for UTRA TDD HSDPA, simulation results are obtained and confirm the analysis.