Virtual Reality (VR) offers unprecedented opportunities for environmental emotion research and intervention, yet its adoption in research faces significant challenges. This paper presents EchoSphere, an innovative synchronous VR research platform designed to address key obstacles in VR-based environmental research and intervention. EchoSphere addresses three critical issues: limited access to individualized content, difficulties in real-time data collection, and logistical and technological barriers. The platform integrates a user-friendly interface, real-time multi-user multimodal data collection mechanisms, and a portable, cost-effective hardware system based on consumer-grade products. The system's architecture emphasizes usability, accessibility, and scalability, featuring a comprehensive multimodal data collection framework that includes custom questionnaires within VR device data and peripheral device integration. A case study on urban park experiences demonstrates EchoSphere's capabilities in supporting complex, multimodal research designs. EchoSphere represents a step towards more accessible, efficient, and effective VR-based environmental and psychological research.