The micro-mesh gaseous structure (Micromegas) has been significantly developed since it was proposed in 1995 at Saclay (France). Some new construction methods different from "bulk" etching technique are under R&D. Here we report the results of several prototypes manufactured with thermal-bonding method, The details of this method and the performances of the chambers are presented. For a 200 × 200 mm 2 prototype, the energy resolution of 16% (FWHM) for 5.9 keV x-rays is achieved at a gain of 2000-4000. In addition, the sparking-resistant chammber with a Gemanium anode is under studying.