Abstract：Star formation in the Central Molecular Zone (CMZ) of our Galaxy is poorly understood, and is suggested to be suppressed by an order of magnitude despite the large amount of dense molecular gas. Whether there is active star formation at very early evolutionary phases deeply embedded in massive clouds in the CMZ is unclear. To explore the deeply embedded star formation, we carried out ALMA, SMA, and JVLA observations toward massive clouds in the CMZ. Gravitationally bound dense cores are identified with the dust emission, and signatures of star formation are traced by UC HII regions and masers. We also attempt to quantify the star formation rates of the clouds based on these results. Our observations suggest that high-mass star clusters of >10^3 solar masses are arising in the massive clouds, although at the cloud scale the star formation efficiency is still lower than that in nearby clouds.