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We have demonstrated high speed operation at ultra low voltage using Bulk Dynamic Threshold MOSFET (B-DTMOS) which has shallow well with high impurity concentration layer between low impurity concentration layers for reducing signal transmission delay due to body resistance. Advantages of operation speed over conventional MOSFET in ultra low voltage operation are discussed. Even over the region of ultra low power supply voltage and low threshold voltage where forward bias effect is weak, we confirmed the advantage of the B-DTMOS over the conventional MOS. We achieved an extreme fast ring oscillator operation (182 psec/stage in 0.3 V operation) using BDTMOS with low body resistance.