The giant molecular cloud Sagittarius B2 (hereafter SgrB2) is the most massive region with ongoing high-mass star formation in Galaxy. Two ultra-compact HII (UCHII) regions were identified SgrB2's central hot cores, SgrB2(M) and SgrB2(N). Our aim to characterize properties of entire SgrB2 cloud. Comparing dust we depict evolutionary stages different parts SgrB2. We use Very Large Array its A, C...