Laser-plasma particle acceleration is a non-traditional acceleration technique that could lead to a significant downsizing of future high-energy accelerators [1-2]. Recently we conducted laser-plasma electron acceleration research in Shanghai, China. Experiments were based upon a newly-installed 200 TW 30 fs Ti:sapphire laser. We performed a few types of laser wakefield acceleration (LWFA) experiments; the first was based on the self-injection of electrons in 4 mm long He plasma interacted with 30 TW laser pulses (a0 ~1.2). We observed ~120 MeV electron beams with ~ 40 % energy-spread . In order to improve the electron beams we conducted a second type of experiments where we employed the ionization-injection mechanism, by which we observed a significant enhancement of the beam energy up to 400 MeV and a reduction of the energy-spread to 4% . In a follow-up experiment on ionization injection, and in order to boost the electron energy and quality, we employed ~ 120 TW laser pulses and 1 cm-scale plasma. Here we observed narrow energy-spread beams (7 %) with 1.2 giga-electron volts peak energy; see Fig. 1 . The experimental results and the involved physics were all verified by 3D-PIC simulations using OSIRIS code. Additionally, we have measured the emission of synchrotron x-rays (due to the betatron oscillations) from the accelerated relativistic electrons; few mrad, hard x-ray beams with energy up to 100 keV were observed . Finally, by the electrodynamics process of bremsstrahlung we have observed electron-position pairs with energies of 100 MeV and 10 MeV gamma ray beams . In my talk, some of those topics  will be discussed in details.