The GD32VF103 series MCUs feature a new Bumblebee processor core based on the open-source RISC-V instruction set architecture, delivering a 108MHz operating frequency, along with 16KB to 128KB of on-chip flash memory and 6KB to 32KB of SRAM cache. The chips operate at a supply voltage of 2.6V-3.6V, with I/O ports tolerant to 5V levels. A rich set of peripherals is available for a wide range of mainstream applications, including up to 3 USARTs, 2 UARTs, 3 SPIs, 2 I2Cs, 2 I2Ss, 2 CAN2.0Bs, and 1 USB 2.0 FS OTG, as well as an External Bus Expansion Controller (EXMC). The built-in USB 2.0 FS OTG interface supports multiple modes such as Device, HOST, and OTG. The External Bus Expansion Controller (EXMC) facilitates connections to external memories like NOR Flash and SRAM. The MCUs integrate two 12-bit high-speed ADCs with a sampling rate of up to 2.6M SPS, offering up to 16 multiplexed channels, 16-bit hardware oversampling filtering, and configurable resolution, along with two 12-bit DACs. Up to 80% of GPIOs support multiple alternate functions and port remapping, ensuring flexible and extensive connectivity for mainstream development needs. These MCUs are widely suitable for industrial control, consumer electronics, emerging IoT, edge computing, and embedded applications in vertical industries.