Experimental: OVB+Blina+VEN+Chemo-light regimen

All Ph+-ALL patients will uniformly use the 3rd generation of TKI olverembatinib (OVB) instead of dasatinib throughout the regimen. Cyclophosphamide and asparaginase are totally omitted from the entire treatment to mitigate toxicities.~OVB is combined with Vincristine and Prednisone (VP) during the first 2 weeks and with blinatumomab during the last 4 weeks of remission induction in this protocol.~Patients will receive blinatumomab for 28 days as induction instead of CAT to improve induction response and avoid toxicity.~All patients will receive two cycles of HDMTX+Blina-14 and 4 times of triple intrathecal therapy (TIT) throughout the consolidation 1 phase. The dosage of AraC will be reduced to 1 g/m2 in the consolidation 2 phase.~Throughout the early Maintenance Therapy, dexamethasone and vincristine combination will be added with either venetoclax or daunorubicin alternatively for five cycles, given after MTX and 6-MP.